Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d6e8a992a7f54…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 14:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7e823cdf55f6edba42ab215115b6158e SHA-1: 92590a05205c15502be3f10ccfe2d04ef5e2d941 SHA-256: 5f9d6e8a992a7f54d4e063a9d2ad36732dab4f5dc8c512bbc1ef2c3691e30fb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests potential for malicious code execution within the PDF. The link farm likely serves as a lure, directing users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=survival+craft+2+mod+apk PDF link annotation
    • http://albarossa.jp/js/upload/files/28027695385.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/kotugezu.pdfIn PDF document text
    • http://cloverdiamond.com/file/47256400035.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7257e53ec---warubufirujaxabara.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef35301490---sunevesokaribu.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/gefixarokufamul.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/werek.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/muxisofakajinoxu.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ronowisasapuka.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kurumi.pdfIn PDF document text
    • https://fishboat.hr/files/forovolefumaluz.pdfIn PDF document text
    • http://cobweb.janci.net/upload/files/82492337731.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef387dad15---90033754729.pdfIn PDF document text
    • https://khanikango.in/file/xugowafis.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/81380710866.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bc994a07---67707726796.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/49403237725.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/gufuzimigepenovesumikuwes.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/zijinifedubanin.pdfIn PDF document text
    • http://irinabailey.com/upload/files/ziwazujezisirebinuvo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/rizifuvejeresozejawepula.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/terosogabazerutufome.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 10832 bytes
SHA-256: 6980a9b43dd3212587907c8251f1eac0215c1f023337fe68deabea9549313eb5
font_01_sfnt_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 14860 bytes
SHA-256: 0958f0524b2eacb796ad704bc8a3fa2705984c06bc630f9109ef0d2af1aaf32d
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1